Add dynamic support for 4G/LTE/LTE+ icons

Move configuration of show4gForLte and hideLtePlus from resource
to CarrierConfig, to better support MVNOs.

These icons will be updated upon receiving CarrierConfigChange or
in case the default data SIM changes.

Test: Add different carrier config values for a carrier and change carrier.
Tested on both single and dual sim devices.
Bug: 113309357
Bug: 113309356
Change-Id: Ibd34e8948cc5d519626b935545d2c2fb1f771220